DC
DC Current Calculation for Batteries and Devices
Find the current in a DC circuit from a battery voltage and a load, with worked examples.
The Current Calculator Blog
Clear guides to electric current: Ohm's law, power factor, single and three phase supplies, motors, wiring, and more.
Guides
How Many Amps Does an Appliance Use?
Turn the wattage on an appliance label into the amperage it draws on your supply.
Wiring
Wire Size and Current: Matching Cable to Amps
Why current determines the cable you need, and how ampacity, length, and heat come into it.
Conversions
How to Convert kW to Amps
Convert kilowatts to amps for DC, single phase, and three phase, with the exact formulas.
Wiring
Voltage Drop Explained and How Current Affects It
Why long cable runs lose voltage, how current drives the loss, and how to keep it in range.
Basics
Current in Series and Parallel Circuits
How current splits and adds across series and parallel resistors, with clear diagrams in words.
AC Theory
Kirchhoff's Current Law in Plain English
The rule that current into a node equals current out, and how to use it to solve circuits.
AC Theory
RMS vs Peak Current in AC Circuits
What RMS really measures, how it differs from peak, and which one your calculator uses.
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